Why is my reputation score not increasing?

Some of your replies to blog posts got downvoted by multiple accounts with high reputations and huge amounts of Steem Power, which ruined your reputation. Everyone starts with 25 reputation, you currently have 7 because of the downvotes from the big accounts. I checked those comments of yours, and those are spam comments, so they downvoted you, because you spammmed.
You need to stop spamming, and you need to write real comments, and publish original content to receive upvotes (from accounts with higher reputation from you) in order to increase your reputation.